St Patrick did not convert Ireland to Christianity

So on Friday 26, I took coach again and on Saturday reached London.
In this journey I read Dr. Warner’s History of Ireland, from its first settlement to the English conquest. And after calm deliberation, I make no scruple to pronounce it a mere senseless romance. I do not believe one leaf of it is true from the beginning to the end. I totally reject the authorities on which he builds: I will not take Flagherty’s or Keating’s word for a farthing. I doubt not, Ireland was, before the Christian era, full as barbarous as Scotland or England. Indeed it appears from their own accounts that the Irish in general were continually plundering and murdering each other from the earliest ages to that period. And so they were ever since, by the account of Dr. Warner himself, till they were restrained by the English. How then were they converted by St. Patrick (cousin-german to St. George!)? To what religion? Not to Christianity. Neither in his age nor the following had they the least savour of Christianity, either in their lives or their tempers.